Dead Giveaway - S1.E8

The 'detectives of death' investigate another slate of bizarre cases, including: a twisted case of sibling sabotage; a mystery where saliva turned a suicide into a homicide; the story of a convicted rapist whose claims of innocence are taken seriously when his DNA turns up on a victim while he is in jail; and a 'final answer' to the question, 'Who was the Black Widow?'